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Erosion and Deposition

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Presentation on theme: "Erosion and Deposition"— Presentation transcript:

1 Erosion and Deposition
Erosion – is the process by which weathered rock and soil particles are moved from one place to another. Deposition – Sediments are laid down in a new location.

2 Five Factors of Erosion
Gravity Wind Running Water Glaciers Waves

3 Gravity Mass Wasting- the downhill movement of sediments caused by gravity. Landslides Mudflows

4 Slump A block of Rock or soil moves down a steep slope with its upper surface tilted backwards as it falls

5 Slow Mass Wasting Earth Flows and Soil creep are two examples of slow mass wasting

6 Wind Erosion Deflation – Wind removes loose materials such as sand, silt and clay Abrasion – Sand Blasting

7 Features formed by Wind Erosion
Dunes – Wind blown sand is deposited near rock and bushes in desert areas Loess – Very fertile, light in color, many meters thick consisting of sand and silt

8 How can you curtail wind erosion?
Bushes, trees and fences act like barriers to block the wind

9 Major Cause of Erosion Running Water – Water turns into runoff as it travels, picking up weathered rock particles and making small grooves in the ground known as Rills. As the Erosional process continues, the grooves become larger and are now called “Gullies.”

10 Factors that affect Runoff
Amount of rainfall Plant Growth Shape of the Land

11 Life Cycle of a River Immature River – Early stages of development
Mature River – In development for thousands of years

12 Life Cycle of a River Meandering – A river begins to curve and wind due to erosional forces

13 Oxbow Lake Large “U” shaped bends forming small lakes

14 As a river leaves a mountain and runs
out onto a flat plain its speed decreases and its sediments are spread out in a fan like shape called an Alluvial Fan

15 Delta - large amounts of sediments deposited
at the mouth of a river that flow into a lake or ocean

16 Rivers overflow their banks after
heavy periods of rain or thaw And leave fine sediment deposits

17 Levees are formed from larger
particles that settle of the sides of rivers

18 Glacial Ice erodes away
rock as it moves by abrasion and plucking away at the rock beneath it

19 Rocks and soil that are deposited by the glacier are called “Till”

20 After a Glacier melts and retreats,
it leaves behind till, which forms a ridge called a “Moraine”

21 An oval shaped mound of Till
is called a “Drumlin”

22 Melt water deposits are left by a
Valley Glacier stops moving

23 Out wash Plains are fan shaped and formed In front of a Terminal Moraine

24 As a Iceberg melts it leaves
its deposits on the Ocean Floor

25 Kettle Lakes (Great Lakes)
form in two ways: Glacial Till deposits form in river channels causing water to form lakes Blocks of ice melt away leaving sediments behind and a depression forms after the ice melts

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